46 national geographic • March 2015
VACCINE BACKLASH At the
Cedarsong Nature School on Vashon
Island, Washington, Kina and Kaia are
among many children who haven’t
been vaccinated against contagious
diseases such as measles. Vaccine
avoidance has surged in the U.S .;
46 states allow religious exemptions
from vaccination requirements, and
19 states allow philosophical ones.